Telephone-transmitter



(No Model.)

E. BERLINER.

TELEPHONE TRANSMITTER.

Patented Feb. 28,1882.

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mus Photo-Ulhugnpher, Washington n. c.

UNITED STATES PATENT ()FFICE.

EMILE BERLINER, OF BOSTON, MASSACHUSETTS.

TELEPHONE-TRANSM ITTER.

SPECIFICATION forming part of Letters Patent No. 254,190, dated February 28, 1882. Applicationfiled December 15, 1 881. (No model.)

To all whom it may concern: Be it known that I, EMILE BERLINER, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain Improvements in Telephone-Transmitters, of which the following is a specification.

This invention relates to that class of telephone-transmitters in which a button or similar inclosed mass of conducting material is interposed in the circuit of an electric current, and by letting sound-waves act upon the said button cause undulations in the said current.

My present invention consists in forming such buttons or masses of conducting pellets orglobules-as, for instance, lead shot of a fine grade or any such well-rounded particleswhich, when pressed together in the form of a button, will not, shift.

I am aware that buttons have been made previously of loose conducting particles-iron or brass filings, oral'so crushed carbon; but in all these instances the irregularity in the form of each particle caused them to shift under the influence of continuous Vibrations. To prevent this shiftin g isthe object of this invention.

In the drawings, A is a metal diaphragm clamped in the usual manner between two blocks, B B, as in an ordinary telephone, and provided with a mouth-piece, G.

D and E are brass blocks, connected to one another by an elastic tubing, F. This tubing is bound around the. brass blocks by wires or bands gg. The space between D and E is filled with conducting-globules, of metal or other material-such as shot or similar well-rounded particles, Gwhich will not shift.

To the block E is fastened a square screw, J, which runs through the adjusting-nut H and frame K. By this arrangement the tubing F can be pulled out or pressed together, thereby adjusting the pressure with which the conductin g-pellets bear against one another.

The block 'D is fixed to the diaphragm by a screw, d, and by means of conductorsp and n this transmitter can be inclosed in a telephonic circuit, in which case by speaking into the mouth-piece G the pressure between the conducting pellets or globules in the mass Gr is varied incorrespondence with each sound-wave according to well-known electrical laws.

I am aware that pellets of conducting material arranged in a tube one ball behind the other have been used ere this, and this I do not claim as my invention; but

EMILE BERLINER.

Witnesses:

Gno. WILLIs PIERcn, J. H. CHEEVER. 

